package com.example.a97369.spinnertest306;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    private TextView textView;
    private Spinner spinner;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        init();
        //定义数据源
        String[] cities={"北京","上海","天津","大连"};
        //实例化适配器，绑定数据源
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,cities);
        //设置spinner下拉按钮的样式
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        //绑定spinner和adapter
        spinner.setAdapter(adapter);
        spinner.setPrompt("请选择城市");

        //spinner条目选择事件
        spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
                textView.setText("您选择的城市是："+parent.getItemAtPosition(position).toString());
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });
    }

    private void init() {
        textView=(TextView)findViewById(R.id.textView);
        spinner=(Spinner)findViewById(R.id.spinner);
    }
}
